The value of tmnxAncpPlcyDisableShcv specifies whether or not
the node will suspend SHCV (Subscriber Host Connectivity Verification)
for the hosts defined with this ANCP policy when a port-down message
is received, until the access node sends a port-up message.
If tmnxAncpPlcyDisableShcvHldTime is non zero, the node will suspend
SHCV for the period of time defined. If tmnxAncpPlcyDisableShcvHldTime
is zero, SHCV is suspended until a port-up message is received.